A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.

A hardo is someone who tries incredibly hard at everything, is an extreme douche, always wants to fight people to show how tough they are, and is generally hated by everybody. Whenever they speak, all you want to say is, "Shut the fuck up."

When you act tough in a not tough situation

Anyone who thinks they're a badass, but is most often a douche. Generally named Craig or Joey.

A hardo is a person who tries unnescesarily hard at anything an everything. Most times a hardo is trying hard at something that does not require excessive effort. For example; sports practices, homework, etc.

(adj). HAR-dO: a hardo is one who thinks they are incredibly hard or overestimates their hardness.

One who thinks they are more muscular than they actually are. Their body type is similar to a marshmallow; comes off as a big object but is really the softest object on earth. This type of person walks around with a puffed out chest similar to a wild bird seeking a mate. They're also one that will hold off surgery since sports teams need this "hardo" player so bad, he will hold this surgery off til the off-season. But the problem is, is that there is no off-season for a "hardo". The mating call of the "hardo" becomes deeper depending on its proximity to its opposite sex, despite its natural high pitch.